Mechanical movement



Oct. 20, 1925.

- 1,558,393 W. T. PRINGLE MECHANICAL MOVEMENT Filed July 3, 1919 2 Sheets-Sheet 1 Oct. 20, 1925. 1,558,393

- w. T. PRINGLE MECHANICAL MOVEMENT Filed July s, 1919 2 Sheets-Sheet 2 Patented Oct. 20, 1925.

UNITED STATES PATENT OFFICE.

WILLIAM T. rnING n, or PHILADELPHIA, PENNSYLVANIA, AssIeNon T0 v. v. FIT- TINGS ooMrANY, or PHILADELPHIA, PENNSYLVANIA, A CORPORATION or PENN- SYLVANIA.

Application filed July 3,

To all whom it may concern:

Be it known that I, WVILLIAM T. PRINGLE, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented Mechanical Movements, of which the following is a specification.

One object of my invention is to provide a novel device for causing two members to. be detachably coupled as long as one of them is moved in one direction or is held from movement against a force tending to return the second member to its original position, while causing the release of the second memher and its return to said original position when the moving or holding force acting on ,qthe first member ceases or is reduced to a predetermined amount.

I further desire to provide mechanism for causing a member to be angularly turned against a retracting force by force exerted on asecond member and thereafter causing the first member to be automatically released from the second member when the latter is moved in a reverse direction or the force operative upon it is decreased.

I also desire to provide novel means for causing automatic disconnection of two temporarily connected moving members when the direction of movement of one of them is reversed or when the moving force is reduced to a predetermined extent.

These objects and other advantageous ends I attain as hereinafter set forth, reference being had to the accompanylng drawings, in which,

Fig. 1 is an elevation, to some extent diagrammatic, illustrating my operating mechanism in its simplest form;

Figs. 2, 3 and 4 are elevations similar to Fig. 1, illustrating the positions occupied by the various parts at different stages of their operation.

Referring to the above drawings, 1 represents a supporting structure such as a late of slate, marble or the like having two lades or arms 2 and 3, movably mounted on it by means of a single pivot pin 4 and of said arms, the first is at all times drawn toward a stop 5 on the structure 1 by means of a spring 6, being provided with a projection in the form of a pin 7.

The second arm 3 is designed to swing in a plane parallel with the plane of movement of the arm 2 and is acted on by a second spring 8, one of whose ends is connected to MECHANICAL MOVEMENT.

1919. Serial No. 308,432.

An operating arm 11 is connected by a pivot 12 to the second arm 3 at or adjacent the middle thereof and carries a pair of limit pins 13 and 14 whereby its movement relatively to the second arm is restricted. The latter however carries a flat spring 15 acting against the stop 14 in such manner as to tend to hold it against the stop 13.

The operating arm 11, in addition to projecting beyond the end of the second arm 3, has a lateral projection terminating in a hooked finger 16 and the pin 7 on the first arm 2 is so placed that while said hook can pass under it as long as the two arms 3 and llare substantially in line, it will be engaged by the hook when the operating arm has, so far turned on thepivot 12 as to move a predetermined distance toward the second stop 14. I I

With the abovedescribed arrangement of parts, if the operating arm 11 be moved toward the stop 5 from the position shown in Fig. 1 to the position shown in Fig. 2, it will cause the second arm 3 to swing with it until its hook 16- has passed under the pin 7 and it has come to rest in engagement with the screw 17 which connects the spring 6 to the first arm. Owing to the fact that when in this position the spring 8 extends to the right of the neutral line a,a, the parts 2 and 3 will remain in the position shown in Fig. 2.

If now the operating arm 11 be moved toward the stop 10 it will, before imparting movement to the second arm 3, so turn on the pivot 12 as to swing its hook 16 upwardly after which it will move said arm 3 with it, causing the hook to engage the pin 7. As a result the arm 2 is turned on the pivot 14 with the second arm 3 and the operating handle 11, against the action of the spring 6, and it is possible to continue this movement until said operating arm or hancircuit one or more fuses in order that they may not be blown by the excessive current flowing when the motor circuit is first closed.

I claim:

1. A mechanical movement consisting of two concentrically pivoted members of which one is provided with a projection; a spring operative on said latter member; means for actuating said latter member, said means being pivotally mounted on the second member and having a portion formed to detachably engage the projection of the first member; with a spring tending to maintain said means in a position wherein said portion is disengaged from said projection.

2. A mechanical movement consisting of two pivotally mounted members; an operating element pivotally mounted on one of the members; means constituting abutments for limiting the movement of said element relatively to said latter member, one of said abutments being resilient; springs respectively tending to maintain said members in definite positions; and means operable to connect said members when said operating element is in engagement with said resilient abutment means.

3. A mechanical movement consisting of two pivotally mounted members; an actuating element pivotally mounted on one of the members; means for limiting the movement of said element relatively to said latter member; springs respectively tending to maintain said members in definite positions; and means for detachably connecting said members consisting of a projection on one member and a hook on the movable actuating element.

4. A mechanical movement consistin of two pivotally mounted members of which one consists of two parts jointed together and having limited relative movement; a spring operative on the jointed member and tending to swing it to either side of a neut*al position; a second spring tending to maintain the other member in a definite position; with means for connecting the members to permit movement of one by the other long as such movement takes place in one direction.

5. The combination of two pivotally mounted arms; a spring tending to retain one of said arms'in a definite position; a second spring tending to move the other arm to either side of a neutral position; a projection on the first arm; an operating ele-' ment pivoted to the second arm and having a hook for detachably engaging the projection of the first arm; means for limiting movement of said element relatively to its supporting arm; and a spring tending to retain the element and its supporting arm in definite relative positions.

6. A mechanical movement consisting of two coaxially mounted members; spring means operative on said members; an operating element pivotally mounted on one of the members and having a portion formed to detachably engage the other member; and resilient means tending to maintain said element in its disengaged position.

7. A mechanical movement consisting. of two pivotally mounted members; springs tending to maintain said members in definite positions respectively; and an operating element pivotally mounted on one of said members and formed to detachably engage the other member when the member is in one position and to release said second member when the first member occupies another position. I

In witness whereof I atlix my signature.

\VILLIAM T. PRINGLE. 

